Scharf, Benedikt and Frank, Tobias and Gmitra, Martin and Fabian, Jaroslav and Zutic, Igor and Perebeinos, Vasili (2016) Excitonic Stark effect in MoS2 monolayers. PHYSICAL REVIEW B, 94 (24): 245434. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
We theoretically investigate excitons in MoS2 monolayers in an applied in-plane electric field. Tight-binding and Bethe-Salpeter equation calculations predict a quadratic Stark shift, of the order of a few meV for fields of 10 V/mu m, in the linear absorption spectra. The spectral weight of the main exciton peaks decreases by a few percent with an increasing electric field due to the exciton field ionization into free carriers as reflected in the exciton wave functions. Subpicosecond exciton decay lifetimes at fields of a few tens of V/mu m could be utilized in solar energy harvesting and photodetection. We find simple scaling relations of the exciton binding, radius, and oscillator strength with the dielectric environment and an electric field, which provides a path to engineering the MoS2 electro-optical response.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSITION-METAL DICHALCOGENIDES; QUANTUM-WELL STRUCTURES; FEW-LAYER MOS2; VALLEY POLARIZATION; ATOMIC MONOLAYER; BINDING-ENERGY; WS2; WSE2; SEMICONDUCTOR; TRANSISTORS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 11 Apr 2019 11:12 |
| Last Modified: | 11 Apr 2019 11:12 |
| URI: | https://pred.uni-regensburg.de/id/eprint/3767 |
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